Voltage Transformer
A Voltage Transformer (VT) is a device which converts energy of one form to another. VT’s are used to monitor alternating AC or DC current by measuring voltage directly or through a VT. Voltage Transformers are a parallel connected type of instrument transformer. They are designed to present negligible load to the supply being measured. They have an accurate voltage ratio and phase relationship to enable accurate secondary connected metering.
Current Transformer
An instrument transformer that is used to generate an AC within the secondary winding of the transformer is known as a current transformer. This is also known as a series transformer as it is allied in series with the circuit for measuring different parameters of electric power Here the current in the secondary winding is proportional to the current in the primary winding. These are used to reduce high voltage currents to low voltage currents.